So I've got this mp4 that took me a very long while to download (read: weeks) and it worked fine until it suddenly didn't.
I haven't done anything that might corrupt it as far as I know, and the file integrity seems intact considering are the Metadata seems to be there and I think I remember that these should be blank if the file is corrupted?


But when I try to play it the screen stays black (or goes grey) and the audio just plays with occasional stuttering and glitchy sounds.
Opening it in Movie Maker just gives an empty seven second video with an error sign on the thumbnail, putting it in a File converter gives an empty thumbnail and no progress in conversion.

Aside from help, I also accept a confirmation that it's corrupted so I know I might as well give up.